Attics should be insulated to R-40 to 60 by adding extra layers of fibreglass batts or blowing in cellulose or loose fibreglass – Remember to draftproof your attic before you add insulation.

 

Please see Plugging the Leaks section on attics as there is a lot of opportunity for air leakage in an attic.

 

Products

 

Fibreglass batts
Cellulose
Loose Fibreglass

 

Suppliers

 

This type of insulation is widely available at most building supplies stores.